There is ____ s and ___u in the word 填a还是an?

There is ____ ''b'',____ ''u'' and ____ ''S'' in the word ''bus'' . 选择适当形式填空There is ____ y and ____ s in the word yes There is ____ s and ___u in the word 填a还是an? 44.There is a big desk between ____ and ____. There is ____ m and ______ m and ______ m In Alicia's,there is an apple and some ____?A.books.B.bananas.C.balls.D.coffee. ____ ____ is ten and ten It's twenty. There are four ____ and two ____ at the ____. 为什么是johns,marys,doctor's 用was,were,is,are填空.______they students?Yes,____ ____.完成对话,没空一词.A：____ ____,sir.Can you tell me ____ ____ to Xili Lake?B：Sorry,I ’m ____ here.Look,there’s a ____ over there ,Go and ask him.A:Excuse me sir.____ ____ l get 用was,were,is,are填空. ______they students?Yes,____ ____.完成对话,没空一词.A：____ ____,sir.Can you tell me ____ ____ to Xili Lake?B：Sorry,I ’m ____ here.Look,there’s a ____ over there ,Go and ask him.A:Excuse me sir.____ ____ l g There is ____ fish and vegetables in the fridge. it's( )And there is a(it's( )And there is a( ) on her face There is ____u and ____ s in the word bus''这一类题目怎么分辨用a还是an呢? 写句子there is/there area boy and a girl 有一个男孩儿和一个女孩儿.____ ____ ____ ____ ____ ____ ____ . There is so much s ____ in the world. Is there a s ____ pool in your school. There are two boys over there.One is Mike and ____ is Alan. This is Tom's classroom.There are 30____.There is a clock____.